Improvement in steam-generators



UNITED c STATEs PATENT OEETOE.

JOHN E. ALLEN, OE NEW YORK, 'n.r.

IMPROVEMENT IN STEAM-GENIERATORS.

Specification forming part of Letters Patent No. 113,613, dated April11, 1871.

` To all whom t may concern:

Be it known that I, JOHN F. ALLEN, of New York, in the county and; Stateof New York, vhave invented certain Improvements in Steam- Generators,of which the following is a speciiication:

Figure I represents a longitudinal section of a boiler embodying myinvention, and Fig. 1I is a cross-section of the same.

Similar letters represent similar parts.

My invention consists in the arrangement of a series of oval or roundchambers or tubes, A, runninghorizontally, or nearly'so, the wholelength of the boiler, and placed side by side, of any desired number.

The after ends of these tubes Arest on rollers a, or other suitablesupports attached to the after or back brick wall, Q, to allow for theexpansion of said pipes, while the forward ends of said tubes projectpartly through an openin g, d, made in the front brick wall, y, andclosed by a suitable plate, n, to give easy access to the tubes for thepurpose of cleaning the same. Above these tubes A, and near theirforward ends, a drum, B, is arranged,

. running crosswise, to the bottom of which the several tubes A areattached by means of nipples m, having right and left handed threads.

Small plates are riveted to the inside of the drum for the purpose ofstrengthening the same where the nipples en ter.

Into the lower side of the chambers or tubes Apipes C are securelyfastened, inclining backward at about twenty degrees inclination.

These pipes G are welded circular at the bot tom, and provided with aplug screwed into the ends for the purpose of cleaning the same.

Above and near the fire, or where most exposed to the direct action ofthe fire, these pipes C are made about four inches in diameter by fourfeet in length, or about in that proportion of area of tubes to surfaceexposed, and increase in length as the same are farther away from thedirect effect of the lire.

By this arrangement of giving the tubes the above-mentioned inclination,and by making the same in the specified proportions, a per-v fectcirculation will be obtained in these pipes without the necessity ofplacing any internal -tubes or loose plates into the same forthepurthrough the pipes c c, with the bottom of the drum B, whereby aperfect circulation between the different sections forming thesteam-genh i erator is obtained.

The pipes o c are provided with suitable cocks as, for the purpose ofusing said pipes for feeding and blowing off the boiler.

On the bottom of one of the after rows of pipes-G provisions are madefor attaching the plate S, the forward end of which rests upon aprojection on the back of the bridgewall D. This plate S stops thedownward draft and supports the brick wall J, situated near the afterend of the boiler, between two rows of pipes, to cause the current ofthe draft to pass upward and over saidbrick wall J, as indi cated by thearrow.

By this arrangement the gases, before entering the chimney, are causedto pass over and around the last rows of the pipes C, through which thecooler feed-water is made to enter, thereby extracting the heat from theescaping gases more effectively before entering the chimney by bringingthem in contact with sur The top wall, W, of the brickwork inclosin gthe boiler islaid close upon the horizontal tubes A, with the exceptionof that part directly over the fire X, wherel an arch, V, is

-to secure by Letters Patent, is'- l. The combination of horizontaltubes A with the inclined pipes C, substantially as and for the purposehereinbefore described.

2. The combination of one of the last rows of pipes C, connections u,pipes o o, and steamdrum B, substantially in the manner and for thepurpose described.

3. The combination of the horizontal tubes A,drun1B, tubes C, and rightand left threaded nipples m and w, substantially as and for the purposeherein set forth.

JOHN F. ALLEN. Witnesses: l

HENRY E. ROEDER, LoUIs SOHMULLING.

